I just went through this installing a Joying Android head unit. Splicing the factory wiring was not difficult using the legend on TLC faq and in this thread. For the speaker wires, I used the screw-post type RCA connectors into the head unit pre-amp output jacks:
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They don't provide the most secure connection and are really jammed in back there so I might have to switch to a proper low-profile, right-angle pigtail the next time I'm in there (still have to plug in the GPS antenna, back-up cam etc.). Pretty happy with the results, though:
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